базовая логика скачивания обновлений

lib/features/launcher/domain/entities/client_hash_entry.dart

@@ -0,0 +1,30 @@
+import 'dart:convert';
+
+import 'package:crypto/crypto.dart';
+import 'package:path/path.dart' as p;
+
+abstract interface class ClientHashEntry {
+  String get path;
+  int get size;
+  String get sha256;
+}
+
+String normalizeClientPath(String rawPath) {
+  final sanitized = rawPath.replaceAll('\\', '/').trim();
+  final normalized = p.posix.normalize(sanitized);
+  return normalized.startsWith('./') ? normalized.substring(2) : normalized;
+}
+
+String computeBuildHash(Iterable<ClientHashEntry> entries) {
+  final canonicalEntries =
+      entries
+          .map(
+            (entry) =>
+                '${normalizeClientPath(entry.path)}:${entry.size}:${entry.sha256.toLowerCase()}',
+          )
+          .toList()
+        ..sort();
+
+  final payload = canonicalEntries.join('\n');
+  return sha256.convert(utf8.encode(payload)).toString();
+}